the PR fixes the following things:
- change the way centerlines between 2 lines are calculated. The current implementation leads to many bugs and even crashes (e.g. when the 2 selected lines are parallel ones of a square). There are different forum threads from the last 1.5 years.
The new endpoint line sorting is the one described here: https://forum.freecadweb.org/viewtopic.php?f=35&start=20&t=44255&sid=989a668890f954c13ef81e4a04ee6912#p501179
- as consequence the erroneous and misleading line end flipping can go and is removed (only used internally)
- when creating a new centerline, you see it immediately
- when creating a new or editing an existing centerline and press Cancel, the creation/editing is aborted
- fix crash when the 2 selected lines are bot horizontal and one tries to create a vertical centerline
- fix crash when changing the orientation of an existing centerline and the result would be invalid
- cleanup the code a bit
Coverity warnings fixed:
CID 316559 (#1 of 1): Uninitialized scalar variable (UNINIT)
3. uninit_use_in_call: Using uninitialized value we. Field we.idx is uninitialized when calling push_back
CID 316549 (#1 of 1): Uninitialized scalar field (UNINIT_CTOR)
4. uninit_member: Non-static class member pageheight is not initialized in this constructor nor in any functions that it calls.
CID 186161 (#1 of 1): Uninitialized pointer field (UNINIT_CTOR)
2. uninit_member: Non-static class member parent is not initialized in this constructor nor in any functions that it calls.
CID 305170 (#1 of 1): Dereference before null check (REVERSE_INULL)
check_after_deref: Null-checking this->m_baseFeat suggests that it may be null, but it has already been dereferenced on all paths leading to the check.
CID 186152 (#2 of 2): Uninitialized pointer field (UNINIT_CTOR)
3. uninit_member: Non-static class member m_mdi is not initialized in this constructor nor in any functions that it calls.
CID 192588 (#1 of 1): Same on both sides (CONSTANT_EXPRESSION_RESULT)
pointless_expression
The XML standard stipulates:
The prefix xml is by definition bound to the namespace name http://www.w3.org/XML/1998/namespace. It MAY, but need not, be declared, and MUST NOT be bound to any other namespace name. Other prefixes MUST NOT be bound to this namespace name, and it MUST NOT be declared as the default namespace.
If the document does not explicitly include this namespace, it is added. This prevents errors due to the use of the namespace in some imported SVG files. In debug builds those errors emit warning messages, and in Windows debug builds those errors cause an abort() to be called.
also fix issue that tolerance could be set despite theoretically exact is true under some circumstances
also some wording improvements
also a minor fix to use 0.0 instead of DBL_MIN
as discussed here: https://forum.freecadweb.org/viewtopic.php?f=35&t=54218
when a value is theoretically exact it must not have a tolerance
This PR
* fixes this
* also fixes the bug that OverTolerance must not be negative if the tolerances are equal
