ui: Keyboard controls (#935)

* switch focus between views with Tab
* move focus within views with WASD/HJKL/Arrows
* move focus between graph edges by holding Shift
* move focus between code references by holding Shift
* removed graph panning with WASD and moved zooming to Alt + W/S
* removed graph navigation by pressing starting character in graph view lists
* changed local reference and custom trail shortcuts
* updated Keyboard Shortcuts window
* use common back and forward shortcuts and YZ & Shift + YZ
* fix macOS issue where widgets don't get proper focus after creating a new tab
* don't use shared_ptr in QtMainView

fixes #486, #327, #214, #210

testing/keyboard_controls/data/code_view.cpp

@@ -0,0 +1,192 @@
+
+#define CODE_TESTS
+
+#include "header.h"
+
+// NOTE: complete in both snippet and single mode
+
+// TEST: Move Focus between locations
+// START ----------------------------------------------------------------------
+
+int sum(int a, int b) // <- ACTION: focus location via hover
+{
+	return a + b;
+}
+
+int diff(int a, int b)
+{
+	return a - b;
+}
+
+int mult(int a, int b)
+{
+	return a * b;
+}
+
+int div(int a, int b)
+{
+	return a / b;
+}
+
+// ACTION: Use WASD for navigation
+// RESULTS:
+// - Focus is moved between locations
+// - lines without locations are skipped
+// - focus tries to stay at same column if possible
+// - view scrolls up and down if focus leaves visible viewport
+
+// ACTION: Use HJKL for navigation
+// RESULTS: same as above
+
+// ACTION: Use arrow keys for navigation
+// RESULTS: same as above
+
+// END ------------------------------------------------------------------------
+
+
+
+// TEST: Activate location
+// START ----------------------------------------------------------------------
+
+int decimate(int a) // <- ACTION: move focus on 'decimate'
+{
+	return div(a, 10);
+}
+
+// ACTION: Press Enter/E
+// RESULT: 'decimate' is activated
+
+// END ------------------------------------------------------------------------
+
+
+
+// TEST: Activate local symbol
+// START ----------------------------------------------------------------------
+
+int pow(int a, int b)
+{
+	int r = 1; // <- ACTION 1: move focus on 'r'
+	for (int i = 0; i < b; ++i)
+	{
+		r *= a;
+	}
+	return r; // <- ACTION 3: move focus on 'r'
+}
+
+// ACTION 2: Press Enter/E
+// RESULT 2: 'r' is activated
+
+// ACTION 4: Press Enter/E
+// RESULT 3: 'r' is deactivated
+
+// END ------------------------------------------------------------------------
+
+
+
+// TEST: Navigate between active locations
+// START ----------------------------------------------------------------------
+
+int square(int a)
+{
+	return mult(a, a); // <- ACTION: activate 'mult'
+}
+
+// ACTION: Hold Shift and navigate with keyboard
+// RESULT: focus is moved between the active locations of 'mult'
+
+// END ------------------------------------------------------------------------
+
+
+// TEST: Navigate between active local locations
+// START ----------------------------------------------------------------------
+
+int cube(int a)
+{
+	int r = square(a); // <- ACTION 1: activate 'square'
+	r = mult(r, a);
+	return r; // <- ACTION 2: activate 'r'
+}
+
+// ACTION: Hold Shift and navigate with keyboard
+// RESULTS:
+// - focus is moved between the active locations of 'square'
+// - focus is moved between the active local locations of 'r' inbetween
+
+// END ------------------------------------------------------------------------
+
+
+
+// NOTE: Snippet mode only
+
+
+
+// TEST: Expanding scopes
+// START ----------------------------------------------------------------------
+
+// ACTION 5: Move focus to file expansion above and press Enter/E
+
+class Calculator
+{
+public:
+	int getValue() const
+	{
+		return m_value;
+	}
+
+	// ACTION 4: Move focus to scope expansion above and press Enter/E
+	void clearValue()
+	{
+		m_value = 0;
+	}
+
+	void add(int a) // <- ACTION 1: activate 'add'
+	{
+		m_value += a;
+	}
+	// ACTION 2: Move focus to scope expansion below and press Enter/E
+
+	void diff(int a)
+	{
+		m_value -= a;
+	}
+	// ACTION 3: Move focus to scope expansion above and press Enter/E
+
+	void mult(int a)
+	{
+		m_value *= a;
+	}
+
+	void div(int a)
+	{
+		m_value /= a;
+	}
+
+private:
+	int m_value = 0;
+};
+
+// RESULTS 1-4:
+// - scope is expanded and focus is placed to location closest to expanded line
+
+// BROKEN: focus is placed but not visible
+// RESULT 5: Whole file is expanded and focus placed at closest location
+
+// END ------------------------------------------------------------------------
+
+
+
+// TEST: Expand/Minimize snippets
+// START ----------------------------------------------------------------------
+
+int half(int a) // <- ACTION 2: activate 'int'
+{
+	return div(a, 2);
+}
+
+// ACTION 2: Move focus to snippet title bar and press Enter/E
+// RESULT 2: Snippet is collapsed
+
+// ACTION 2: Press Enter/E again
+// RESULT 2: Snippet is expanded again
+
+// END ------------------------------------------------------------------------