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search tool (CTRL+F): option "complete words" delivers more results than expected

Description

If the search-tool is used with the option "words" checked than it seems that spaces and underscores work as separator between "words". This delivers more results than at first expected.

From a programmers view I can understand that, as variables are often written/separated with underscores. In the context of EDA-design it's a bit surprising.

Affects both, board and schematic editor.

forum thread: https://forum.kicad.info/t/issue-on-find-layout-text-matching-words-seems-not-to-be-working-fine/42560

Steps to reproduce

  1. open attached project, open schematic + board: search_underscore.zip
  2. run CTRL+F (search command)
  3. use search-phrase "PA", option Words" checked
  4. observe: the additional netnames/labels PA_TX + PA_RX are shown as results

search_words

KiCad Version

Application: KiCad Schematic Editor x64 on x64

Version: 7.0.3-24-g09febce4ce, release build

Libraries:
	wxWidgets 3.2.2
	FreeType 2.12.1
	HarfBuzz 6.0.0
	FontConfig 2.14.1

Platform: Windows 10 (build 19045), 64-bit edition, 64 bit, Little endian, wxMSW

	wxWidgets: 3.2.2 (wchar_t,wx containers)
	Boost: 1.81.0
	OCC: 7.6.3
	Curl: 7.88.1-DEV
	ngspice: 40
	Compiler: Visual C++ 1936 without C++ ABI

Build settings:
	KICAD_SPICE=ON