feat(examples): add nano-style text editor (SDL2)#9
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A real working editor for 320x170: line-array text buffer with insert/ delete/newline, vertical + horizontal scrolling with a line-number gutter, blinking cursor, selection with on-screen highlight, cut/copy/paste through the SDL system clipboard, and file open/save/save-as with a dirty flag and save-on-quit prompt. nano-style Ctrl command set and status bar. Keys: arrows/PgUp/PgDn move, Shift+move select, ^S save, ^O save-as, ^K cut, ^C copy, ^U/^V paste, ^G select-all, ^A/^E line start/end, ^Q/^X quit. Verified in the emulator: open file, type (dirty *), scroll, select+ highlight, clipboard paste, ^S writes to disk. arm64 .deb packages clean. Includes a 48x48 app icon.
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A real working editor for 320x170: line-array text buffer with insert/ delete/newline, vertical + horizontal scrolling with a line-number gutter, blinking cursor, selection with on-screen highlight, cut/copy/paste through the SDL system clipboard, and file open/save/save-as with a dirty flag and save-on-quit prompt. nano-style Ctrl command set and status bar.
Keys: arrows/PgUp/PgDn move, Shift+move select, ^S save, ^O save-as, ^K cut, ^C copy, ^U/^V paste, ^G select-all, ^A/^E line start/end, ^Q/^X quit.
Verified in the emulator: open file, type (dirty *), scroll, select+ highlight, clipboard paste, ^S writes to disk. arm64 .deb packages clean. Includes a 48x48 app icon.