Leveling edge distance count from zero position

[NOVAXIM]

Description

Currently, during manual bed leveling the edge bed coordinates are counted from the minimum value if >=0 (Home position). Unfortunately, when we have coordinates other than 0 at the Home position (e.g. size_min:X-10 Y-5), the physical edge positioning will is faulty. With level edge distance value at 20, the lower left corner will be at real position X10 Y15, not X20 Y20 (liked in Marlin). The last fix did not completely delete the problem.
Positioning with manual leveling is an internal affair of TFT Firmware and should not be fixed otherwise as here.

Benefits

This solution calculates the correct bed edge coordinates for manual leveling regardless of:

• Marlin version,
• M115_GEOMETRY_REPORT Marlin option,
• end stoppers position.

The level_edge_distance will be counted from true 0 position (liked in Marlin). For example, if you have size_min: X-5 Y-18 and level_edge_distance: 30, the lower left leveling point would be at real X30 Y30 (liked in Marlin). This applies to all corners and center point too (if you have the correct size_max).

Note: When you have enabled M115_GEOMETRY_REPORT option in Marlin, then don't need to set size_min and size_max. However, if you don't have M115_GEOMETRY_REPORT option in Marlin, then you then you have to enter values for size_min and size_max in file(s): config.ini and/or Configuration.h.

Related Issues

#1151

[digant73]

The current solution forces "at least" 0 for minX and minY (with or without M115_GEOMETRY_REPORT enabled) but allows minX, minY > 0 just to apply a sort of inset (reducing also maxX and maxY). E.g. real build volume is 300x300 but you prefer to force an inset of 10mm so you set mixX=10, minY=10, maxX=290, maxY=290 in config.ini. That scenario will be possible from config.ini in case M115_GEOMETRY_REPORT is disabled (no override from Marlin)

[NOVAXIM]

Sorry but I couldn't correct the file, so I close this PR.