migrate: Qt5/C++11 app to Qt6/C++23 with tests and modern Qt APIs

Entire-Checkpoint: c1ee98dc34a3

build/Testing/Temporary/CTestCostData.txt

@@ -0,0 +1,3 @@
+main_test 1 0.0201882
+MainWindow_test 1 0.0232286
+---

build/Testing/Temporary/LastTest.log

@@ -0,0 +1,66 @@
+Start testing: Aug 13 08:16 UTC
+----------------------------------------------------------
+1/2 Testing: main_test
+1/2 Test: main_test
+Command: "/workspace/build/tests/main_test"
+Directory: /workspace/build/tests
+"main_test" start time: Aug 13 08:16 UTC
+Output:
+----------------------------------------------------------
+Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
+Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead.
+If this causes problems, reconfigure your locale. See the locale(1) manual
+for more information.
+********* Start testing of MainTest *********
+Config: Using QtTest library 6.10.2, Qt 6.10.2 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 15.2.0), ubuntu 26.04
+PASS   : MainTest::initTestCase()
+PASS   : MainTest::testRegularExpressionValidation(valid_input_Test123)
+PASS   : MainTest::testRegularExpressionValidation(valid_input_ABC456)
+PASS   : MainTest::testRegularExpressionValidation(valid_input_a1)
+PASS   : MainTest::testRegularExpressionValidation(invalid_input_123Test)
+PASS   : MainTest::testRegularExpressionValidation(invalid_input_special)
+PASS   : MainTest::testRegularExpressionValidation(invalid_input_empty)
+PASS   : MainTest::testQStringUtf8Conversion()
+PASS   : MainTest::testRegularExpressionPattern()
+PASS   : MainTest::cleanupTestCase()
+Totals: 10 passed, 0 failed, 0 skipped, 0 blacklisted, 1ms
+********* Finished testing of MainTest *********
+<end of output>
+Test time =   0.02 sec
+----------------------------------------------------------
+Test Passed.
+"main_test" end time: Aug 13 08:16 UTC
+"main_test" time elapsed: 00:00:00
+----------------------------------------------------------
+
+2/2 Testing: MainWindow_test
+2/2 Test: MainWindow_test
+Command: "/workspace/build/tests/MainWindow_test"
+Directory: /workspace/build/tests
+"MainWindow_test" start time: Aug 13 08:16 UTC
+Output:
+----------------------------------------------------------
+Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
+Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead.
+If this causes problems, reconfigure your locale. See the locale(1) manual
+for more information.
+********* Start testing of MainWindowPatternTest *********
+Config: Using QtTest library 6.10.2, Qt 6.10.2 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 15.2.0), ubuntu 26.04
+PASS   : MainWindowPatternTest::initTestCase()
+PASS   : MainWindowPatternTest::testPatternValidLettersThenDigits()
+PASS   : MainWindowPatternTest::testPatternInvalidDigitsThenLetters()
+PASS   : MainWindowPatternTest::testPatternInvalidSpecialCharacters()
+PASS   : MainWindowPatternTest::testScreenGeometryExtraction()
+PASS   : MainWindowPatternTest::testRegularExpressionContainsMethod()
+PASS   : MainWindowPatternTest::cleanupTestCase()
+Totals: 7 passed, 0 failed, 0 skipped, 0 blacklisted, 1ms
+********* Finished testing of MainWindowPatternTest *********
+<end of output>
+Test time =   0.02 sec
+----------------------------------------------------------
+Test Passed.
+"MainWindow_test" end time: Aug 13 08:16 UTC
+"MainWindow_test" time elapsed: 00:00:00
+----------------------------------------------------------
+
+End testing: Aug 13 08:16 UTC