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e598811e76
Avoid clearing the screen in most situations. NOT_VALID should be equivalent to CLEAR unless some external force messed up the terminal, for these situations <c-l> and :mode will still clear the screen. Also eliminate some obsolete code in screen.c, that dealt with that in vim drawing window 1 can mess up window 2, but this never happens in nvim. But what about slow terminals? There is two common meanings in which a terminal is said to be "slow": Most commonly (and in the sense of vim:s nottyfast) it means low bandwidth for sending bytes from nvim to the terminal. If the screen is very similar before and after the update_screen(CLEAR) this change should reduce bandwidth. If the screen is quite different, but there is no new regions of contiguous whitespace, clearing doesn't reduce bandwidth significantly. If the new screen contains a lot of whitespace, it will depend of if vsplits are used or not: as long as there is no vsplits, ce is used to cheaply clear the rest of the line, so full-screen clear is not needed to reduce bandwith. However a left vsplit currently needs to be padded with whitespace all the way to the separator. It is possible ec (clear N chars) can be used to reduce bandwidth here if this is a problem. (All of this assumes that one doesn't set Normal guibg=... on a non-BCE terminal, if you do you are doomed regardless of this change). Slow can also mean that drawing pixels on the screen is slow. E-ink screens is a recent example. Avoiding clearing and redrawing the unchanged part of the screen will always improve performance in these cases. |
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| .. | ||
| api_functions_spec.lua | ||
| backtick_expansion_spec.lua | ||
| buf_functions_spec.lua | ||
| changedtick_spec.lua | ||
| container_functions_spec.lua | ||
| executable_spec.lua | ||
| execute_spec.lua | ||
| fnamemodify_spec.lua | ||
| function_spec.lua | ||
| getline_spec.lua | ||
| glob_spec.lua | ||
| has_spec.lua | ||
| hostname_spec.lua | ||
| input_spec.lua | ||
| interrupt_spec.lua | ||
| json_functions_spec.lua | ||
| let_spec.lua | ||
| map_functions_spec.lua | ||
| match_functions_spec.lua | ||
| minmax_functions_spec.lua | ||
| modeline_spec.lua | ||
| msgpack_functions_spec.lua | ||
| null_spec.lua | ||
| operators_spec.lua | ||
| printf_spec.lua | ||
| reltime_spec.lua | ||
| server_spec.lua | ||
| setpos_spec.lua | ||
| sort_spec.lua | ||
| special_vars_spec.lua | ||
| string_spec.lua | ||
| system_spec.lua | ||
| timer_spec.lua | ||
| uniq_spec.lua | ||
| vvar_event_spec.lua | ||
| writefile_spec.lua | ||