axis: warn when run_warn used a truncated preview

run_warn() checks program extents from the preview parse. An aborted parse
(PREVIEW_TIMEOUT or cancel) skips calc_extents(), leaving init extents, so
run_warn() gives a false all-clear. Compute partial extents on abort and
flag the preview incomplete so run_warn() reports it.

Author: grandixximo

lib/python/rs274/glcanon.py

@@ -129,6 +129,8 @@ def __init__(self, colors, geometry, is_foam=0, foam_w=1.5, foam_z=0.0):
         self.min_extents_notool_zero_rxy = [9e99,9e99,9e99]
         self.max_extents_notool_zero_rxy = [-9e99,-9e99,-9e99]
         self.colors = colors
+        # Set if the parse was aborted, so the extents above are only partial.
+        self.preview_incomplete = False
         self.in_arc = 0
         self.xo = self.yo = self.zo = self.ao = self.bo = self.co = self.uo = self.vo = self.wo = 0
         self.dwell_time = 0
@@ -2016,7 +2018,15 @@ def make_main_list(self, unused=None):
     def load_preview(self, f, canon, *args):
         self.set_canon(canon)
         self.preview_too_large = False
-        result, seq = gcode.parse(f, canon, *args)
+        canon.preview_incomplete = False
+        try:
+            result, seq = gcode.parse(f, canon, *args)
+        except KeyboardInterrupt:
+            # Aborted parse: extents cover only the parsed portion. Flag it so
+            # callers do not treat the partial check as complete.
+            canon.preview_incomplete = True
+            canon.calc_extents()
+            raise
 
         if result <= gcode.MIN_ERROR:
             self.canon.progress.nextphase(1)

src/emc/usr_intf/axis/scripts/axis.py

@@ -1901,6 +1901,11 @@ def run_warn():
             if o.canon.max_extents_notool[i] > machine_limit_max[i]:
                 warnings.append(_("Program exceeds machine maximum on axis %s")
                     % "XYZABCUVW"[i])
+        # A truncated preview only checked part of the program; warn rather
+        # than imply a clean all-clear.
+        if getattr(o.canon, "preview_incomplete", False):
+            warnings.append(_("G-code preview was truncated before completion; "
+                "machine limits could not be fully checked."))
     if warnings:
         text = "\n".join(warnings)
         return int(root_window.tk.call("nf_dialog", ".error",