FWIW, automatically moving caret when scrolling viewport would break any multi-cursor-operation with related carets not fitting into viewport. It only works for single-cursor editors.
When scrolling via mouse, it should be the most natural operation to left click once onto or nearby the location, which is to be edited.
Instead of just moving caret via scrolling events, it might be possible to override normal caret movement commands and move it into viewport, before continuing with original operation.
Some time ago, someone complained about pageup/pagedown reverting to old caret location after scrolling far away. It was solved by following plugin, which could maybe extended to hijack up/down/left/right keys.
import sublime
import sublime_plugin
class VisualMovePageCommand(sublime_plugin.TextCommand):
"""
This class describes a visual move page command.
This command moves the caret to center of visible viewport,
if it is not already within, and starts paging up/down from their.
```json
{ "command": "visual_move_page", "args": {"forward": true} }
{ "command": "visual_move_page", "args": {"forward": false} }
```
Pressing pageup/pagedown moves caret up/down by one page, from its current
position even if it is far way from currently visible viewport, which may
cause unexpected visual scrolling.
"""
def run(self, edit, forward=True):
sels = self.view.sel()
visible_region = self.view.visible_region()
if len(sels) == 1 and sels[0] not in visible_region:
first_row, _ = self.view.rowcol(visible_region.begin())
last_row, _ = self.view.rowcol(visible_region.end())
centered_row = int((first_row + last_row) / 2)
centered_pt = self.view.text_point(centered_row, 0)
# adjust caret position
self.view.sel().clear()
self.view.sel().add(centered_pt)
# call normal page up/down command
self.view.run_command("move", {"by": "pages", "forward": forward})
[
// Move By Page (visible viewport instead of current caret location)
{
"keys": ["pageup"],
"command": "visual_move_page", "args": { "forward": false }
},
{
"keys": ["pagedown"],
"command": "visual_move_page", "args": { "forward": true }
},
]
