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bezier: misplaced parenthesis causes incorrect tolerance test

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props: restore the old DiaFileSelector behaviour

readme: fix a couple typos

desktop: specify wmclass

python: use r-strings for regex patterns

build: build with C++20 standard

build: build with C++20 standard

build: build with C++20 standard

build: check for xsl stylesheet when enabling doc targets

ci: ensure xpm-pixbuf is available

general: use xpm-pixbuf to load xpms

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toolbox: provide a more useful log

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display: Silence some warnings by handling all events

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context: act as a proper object

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