Pull request #78: [Offscreen] Improve solving robustness.

Merge in SDK/iink_sdk-additional-examples-android from display-solver-stroke-fix to master

* commit 'dbed5a35708dfc670261bc7296c76039463a77cb':
  [Offscreen] Implicit configuration for solving result.
  [Offscreen] Improve solving robustness.

Author: yannchevalier

samples/offscreen-interactivity/src/main/java/com/myscript/iink/demo/inksample/ui/InkViewModel.kt

@@ -348,10 +348,19 @@ class InkViewModel(
                     recognitionRoot.elements?.forEach { element ->
                         if (element.expressions != null) {
 
+                            val isSolvable = try {
+                                offscreenEditor?.mathSolverController?.getAvailableActions(element.id)?.contains("numerical-computation") == true
+                            } catch (e: IllegalArgumentException) {
+                                false
+                            }
+
                             // If possible, get solver output and strokes.
-                            if (offscreenEditor?.mathSolverController?.getAvailableActions(element.id)?.contains("numerical-computation") == true) {
+                            if (isSolvable) {
                                 val solverJIIX = offscreenEditor?.mathSolverController?.getActionOutput(element.id, "numerical-computation", MimeType.JIIX, engine?.createParameterSet()?.apply {
-                                    setBoolean("export.jiix.strokes", true);
+                                    setBoolean("export.jiix.strokes", true)
+                                    setStringArray("math.solver.numerical-computation", arrayOf("at-right-of-equal-sign"))
+                                    setBoolean("math.solver.enable-syntactic-correction", false)
+                                    setBoolean("math.solver.display-implicit-multiply", false)
                                 })
 
                                 val solverRoot = Gson().fromJson(solverJIIX, SolverRoot::class.java)