vim-patch:8.2.1608: Vim9: getchar() test fails with GUI

Problem:    Vim9: getchar() test fails with GUI.
Solution:   Avoid that getchar(0) gets stuck on K_IGNORE.
15183b41c4

N/A patches for version.c:

vim-patch:8.1.0323: reverse order of VTP calls only needed the first time

Problem:    Reverse order of VTP calls only needed the first time.
Solution:   Add a flag to remember the state. (Nobuhiro Takasaki, closes vim/vim#3366)
2551c037e4

vim-patch:8.1.0777: Win32: using pipes for channel does not work well

Problem:    Win32: using pipes for channel does not work well.
Solution:   Use a larger buffer and handle overlaps. (Yasuhiro Matsumoto,
            closes vim/vim#3782)
b091f30bf3

vim-patch:8.1.0933: When using VTP scroll region isn't used properly

Problem:    When using VTP scroll region isn't used properly.
Solution:   Make better use of the scroll region. (Nobuhiro Takasaki,
            closes vim/vim#3974)
6982f42f33

vim-patch:8.1.0938: background color is wrong in MS-Windows console

Problem:    Background color is wrong in MS-Windows console when not using VTP.
Solution:   Use g_attrCurrent. (Nobuhiro Takasaki, closes vim/vim#3987)
21edde8742

vim-patch:8.2.0178: with VTP the screen may not be restored properly

Problem:    With VTP the screen may not be restored properly.
Solution:   Add another set of saved RGB values. (Nobuhiro Takasaki,
            closes vim/vim#5548)
df54382eac

vim-patch:8.2.0248: MS-Windows: dealing with deprecation is too complicated

Problem:    MS-Windows: dealing with deprecation is too complicated.
Solution:   Use io.h directly. Move _CRT_SECURE_NO_DEPRECATE to the build
            file. Suppress C4091 warning by setting "_WIN32_WINNT". (Ken
            Takata, closes vim/vim#5626)
2f18975088

vim-patch:8.2.0547: Win32: restoring screen not always done right

Problem:    Win32: restoring screen not always done right.
Solution:   Use a more appropriate method. (Nobuhiro Takasaki, closes vim/vim#5909)
e7f234120f

vim-patch:8.2.0581: Win32 console: the cursor position is always top-left

Problem:    Win32 console: the cursor position is always top-left.
Solution:   Revert the patch for restoring screen.
81ccbf199f

vim-patch:8.2.0592: MS-Windows with VTP: cursor is not made invisible

Problem:    MS-Windows with VTP: cursor is not made invisible.
Solution:   Output the code to make the cursor visible or invisible. (Nobuhiro
            Takasaki, closes vim/vim#5941)
2695de63e3

vim-patch:8.2.0646: t_Co uses the value of $COLORS in the GUI

Problem:    t_Co uses the value of $COLORS in the GUI. (Masato Nishihata)
Solution:   Ignore $COLORS for the GUI. (closes vim/vim#5992)
759d81549c

vim-patch:8.2.0658: HP-UX build fails when setenv() is not defined

Problem:    HP-UX build fails when setenv() is not defined.
Solution:   Change "colors" to "t_colors". (John Marriott)
affc8fd2cd

vim-patch:8.2.0793: MS-Windows: cannot build GUI with small features

Problem:    MS-Windows: cannot build GUI with small features. (Michael Soyka)
Solution:   Add #ifdef around use of windowsVersion. (Ken Takata)
1e1d2e89fa

vim-patch:8.2.1975: Win32: memory leak when encoding conversion fails

Problem:    Win32: memory leak when encoding conversion fails.
Solution:   Free the allocated memory. (Ken Takata, closes vim/vim#7277)
bbf9f344af

vim-patch:8.2.1991: Coverity warns for not using the ga_grow() return value

Problem:    Coverity warns for not using the ga_grow() return value.
Solution:   Bail out if ga_grow() fails. (Yegappan Lakshmanan, closes vim/vim#7303)
ca359cbedd

vim-patch:8.2.1992: build fails with small features

Problem:    Build fails with small features.
Solution:   Add #ifdef.
4792a679f9

vim-patch:8.2.1993: occasional failure of the netbeans test

Problem:    Occasional failure of the netbeans test.
Solution:   Add "silent!". (Yegappan Lakshmanan, closes vim/vim#7304)
50dc3ecc64

vim-patch:8.2.1994: MS-Windows: MinGW always does a full build

Problem:    MS-Windows: MinGW always does a full build.
Solution:   Only check if $OUTDIR exists. (Masamichi Abe, closes vim/vim#7311)
c4390fe6c0

vim-patch:8.2.1998: terminal Cmd test sometimes fails to close popup

Problem:    Terminal Cmd test sometimes fails to close popup.
Solution:   Add "term_finish" option.
27f4f6baee

vim-patch:8.2.1999: terminal popup test sometimes fails

Problem:    Terminal popup test sometimes fails.
Solution:   Wait for the popup to close.
e6329e4c55

vim-patch:8.2.2003: build error with +conceal but without +popupwin

Problem:    Build error with +conceal but without +popupwin.
Solution:   Add #ifdef. (Tom Ryder, closes vim/vim#7316)
1efefda623

vim-patch:8.2.2007: test for insert mode in popup is not reliable

Problem:    Test for insert mode in popup is not reliable.
Solution:   Wait for the popup to disappear. (Ozaki Kiichi, closes vim/vim#7321)
17ab28daa0

vim-patch:8.2.2008: MS-Windows GUI: handling channel messages lags

Problem:    MS-Windows GUI: handling channel messages lags.
Solution:   Reduce the wait time from 100 to 10 msec. (closes vim/vim#7097)
032f40afb8

vim-patch:8.2.2009: MS-Windows: setting $LANG in gvimext only causes problems

Problem:    MS-Windows: setting $LANG in gvimext only causes problems.
Solution:   Do not set $LANG. (Ken Takata, closes vim/vim#7325)
382319211a

src/nvim/eval/funcs.c

@@ -2987,11 +2987,12 @@ static void f_getchar(typval_T *argvars, typval_T *rettv, FunPtr fptr)
       // illegal argument or getchar(0) and no char avail: return zero
       n = 0;
     } else {
-      // getchar(0) and char avail: return char
+      // getchar(0) and char avail() != NUL: get a character.
+      // Note that vpeekc_any() returns K_SPECIAL for K_IGNORE.
       n = safe_vgetc();
     }
 
-    if (n == K_IGNORE) {
+    if (n == K_IGNORE || n == K_VER_SCROLLBAR || n == K_HOR_SCROLLBAR) {
       continue;
     }
     break;