Introduce Ctrl+D/Cmd+D temporary overwriting for find widget toggles

[alexdima]

Fixes #8869

Ctrl+D temporary overwriting of the find widget toggles

• only when starting with a collapsed selection on a word, Ctrl+D will override the find widget flags: wholeWords: true, matchCase:true, isRegex: false.
• for as long as Ctrl+D is pressed again, continuously, those flags will remain the effective search flags.
• if a find widget toggle is explicitly changed (e.g. pressing alt+w or alt+c or clicking on a toggle), or if editor focus is lost, or if the selection changes explicitly, the overrides will be reset.

[alexdima]

Some flows:

• in all cases the selection highlighter shows what Ctrl+D will do next

Find widget closed - starting with a collapsed selection

• Ctrl+D uses wholeWords: true and caseSensitive: true
• the find options are briefly shown to reflect the temporary overriden settings
  

Find widget closed - starting with a non-collapsed selection

• Ctrl+D uses the find options
• the find options are briefly shown
  

Find widget opened - starting with a collapsed selection

• Ctrl+D uses wholeWords: true and caseSensitive: true
• the find options reflect the temporary overriden settings
• as soon as the editor loses focus, the find options rollback to their pre-Ctr+D values.
  

Find widget opened - starting with a non-collapsed selection

• Ctrl+D uses the find options
  

[innerlee]

find options are briefly shown

I find the options quite useful but their lives are too short. They always disappear when I want to click on them. Could these buttons be available at the status bar? If this request makes sense, then I will mv it to a issue.

[alexdima]

@innerlee I would not add any extra space for them. The reason for them popping up (only when doing ctrl+D or ctrl+shift+L) is to provide a bit of visual explanation of the used searched settings in the case when the find widget is closed. I would not want to waste any permanent screen estate on those. We can increase their timeout, but they're mostly a quick reminder guide (in the case the find widget is closed).

Perhaps printing something in the status bar would serve the same purpose.

[innerlee]

I reconsidered the request to be not that useful. 99% of the case when I want to click the transient buttons is to set match cases to true. With the change of this pr, I do not need to care about their status most of the time.
But yeah, increase a little timeout will be good :)

[DaltheCow]

When I click on the 'Abl' or 'Aa' section I intend to turn that feature off until I turn it back on manually. Is there a way to make this remember that I don't want whole word match on? Because I often I don't want whole word match on when I'm using this. I ask because I haven't found an alternative for osx yet. I guess windows has alt + c or whatever.

I just found that if I double click the word, then do command + D, it does what I want. But if I put the cursor in a word, then do command + D, then do command + D again, it always has whole word match on, even if I turn it off it comes right back.