Fixes#8104.
As described in that issue, a crash happens under the following
conditions:
1. A `DrawSketchHandler` is active.
2. No constraint is selected.
3. Context menu on the `ConstraintView` is triggered.
* In UIntSpinBox rename the signal to not overwrite the signal of the base class
* In UIntSpinBox use the (ambiguous) signal 'valueChanged' of the base class QSpinBox
* To avoid that connect() fails use the function pointer of the Qt class where the signal is defined
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In uncommon situations, the analysis of QR decomposition leads to full rank, but the result does not converge.
We avoid marking a sketch as fully constrained when no convergence is achieved.
* [TD] remove unused headers
- also some sorting
- also improve readability by not using an abbreviation (we consistently don't abbreviate class names)
- in DimensionValidators.h the declarations must not be with TechDrawExport
- add missing precompiled headers
- also fix too long lines (fixed by clang)
- also some re-sorting
- also remove unused headers
- correct interpretation of True vs Projected
- handle long subelement names in references
- fix "too small" value condition
- better error messages for bad dimension geometry
- separate validation, geometry and reference handling into
individual files
- improve 3d reference geometry handling
- eliminate duplicate dim creation code
- add Dimension reference repair dialog
- Refactor formatting out of DrawViewDimension
- move dimension repaint control to ViewProvider
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1. Instead of excluding internal alignment constraints from popularity candidate selection, exclude them from the group altogether. This
ensures no group is non-empty with uneligible candidates, which prevents an infinite loop in uncommon circumnstances (when DoFs collapse).
2. Ensure no internal alignment constraint is identified when conflict ensues.
