IDE: Fix missing highlighted element in diagrams when using GTK3

- wx's logical function does not work on gtk3, and highlighting relies on it
- skipping logical funciion at all "works" but this now makes highlight opaque
- no easy fix for highlight transparency since emulated with AND Wx logical function
+ added other highlight related cosmetic fix.

.project

.svghmithumbs

.directory
.pytest_cache
.cache
.coverage_full

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^tests/.*/build$
^exemples/.*/build$
^.idea/.*
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^.*\.pyc$
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^.*~$
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^.*\.swp$

bug_report.*\.txt
i18n/.*.new$
revision

doc/_build
doc/locale

^.*\$py.class$