search: make item margin configurable

See merge request kde/kate!12

Avoid using `size` for checking emptiness

See merge request kde/kate!13

(Use dedicated `empty` for it)

Cleanup inheritance specifiers

See merge request kde/kate!11

Adds `override` if it is missing,
removes `virtual` if it's unneeded,
also converts:
`virtual foo();`
to:
`foo() override`
in descendant classes.

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

Plugin search fixes

See merge request kde/kate!10

... rather than matching full doc url against projectfile path part.

using dls as language server

tried first serve-d but didn't work for me

dls did directly provide document outline + diagnostics

and still exit the quick open

same approach as in KTextEditor e.g. search widget

BUG: 409856

CHANGELOG: Add buttons to help with construction of regular expressions to search plugin line edits.

Differential Revision: https://phabricator.kde.org/D23190

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

Avoid copying if it's possible

See merge request kde/kate!9

(Can be meaningful if memory is dynamically allocated.)

Moves values into header, making it easier to read variable's
default state. Also compiler checks types more carefully.

https://code.qt.io/cgit/qt/qt5.git/plain/_clang-format

Add .clang-format file.

See merge request kde/kate!7

Original: https://code.qt.io/cgit/qt/qt5.git/tree/_clang-format

Stuff not applicable to Kate was removed from the file.

Buildplugin enhancements

See merge request kde/kate!6

This reverts commit b98dfc3b.

=> requires too modern KWindowSystem

stop button no longer did show up
now it does again
code now uses widget name an not just index to make usage more clear

... since marks and ranges can be enabled separately.